AMA: Microsoft Teams Performance and Overview

Will users some be able to add an alternate phone number in Teams for themselves? We hoped that the cell number in Delve/SharepointOnline would come over as a secondary number but no go there! Administratively we can store a mobile number in on premise AD and allow it to sync, however a user self service option would be preferred. We have 1000s of users who don't run the Teams mobile client and would like their cell numbers to be visible to coworkers to call via telephony-enabled teams users.